9901587 has 4 divisors (see below), whose sum is σ = 13202120. Its totient is φ = 6601056.

The previous prime is 9901571. The next prime is 9901601. The reversal of 9901587 is 7851099.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9901587 - 2⁴ = 9901571 is a prime.

It is a Duffinian number.

9901587 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9901547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650262 + ... + 1650267.

It is an arithmetic number, because the mean of its divisors is an integer number (3300530).

Almost surely, 2^9901587 is an apocalyptic number.

9901587 is a deficient number, since it is larger than the sum of its proper divisors (3300533).

9901587 is a wasteful number, since it uses less digits than its factorization.

9901587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300532.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 9901587 is about 3146.6787252594. The cubic root of 9901587 is about 214.7343898670.

The spelling of 9901587 in words is "nine million, nine hundred one thousand, five hundred eighty-seven".